Ex$3$: Editing Browsing History $2$

Remove Entries at Certain Positions

Problem Description

In this exercise, you need to implement the function remove$\_$at$($int $r[],$ int size$),$ which removes history entries at certain positions in the browsing history list. The positions are provided in the array $r$ of size size.

Restrictions

Your algorithm must run in $O(n)$ time.

Note that the received array is not sorted. The numbering of nodes in the list starts at $0.$ You can assume the array has no duplicates and does not contain the value $0($i$.$e$.,$ the index of the homepage$).$

Note. Copy your implementations of visit, forward and backward in order for remove$\_$at to work properly

Note. Your implementation must be in dll$.$h$.$